"When we think of psychics many see mystic guru's or followers of Zuoken from the Baklunish lands. Many of us never think of haunted locales or psychic impressions left behind by those whom walked the Oerth before us. In this treatise you will be exposed to such psychic impressions and their affects on those who fall prey to them."
This article is a boon for Greyhawk DMs experienced with psionic rules, yet it can also be beneficial to those who don't normally use psionics but are looking to throw an ancient, mysterious presence at their player characters. Good luck!